碳载PdPb催化剂的制备及对甲酸氧化的电催化性能

采用液相还原共沉积法制备出高活性纳米电催化剂PdPb/C, 研究发现, 碳载Pd催化剂中加入Pb能够提高催化剂对甲酸的电氧化活性, 并改变甲酸氧化的反应机理. 少量Pb的加入能够提高催化剂中活性粒子的分散度, 且大幅度提高催化剂对甲酸氧化的电催化活性. 当催化剂中Pd与Pb的质量比为8: 1时, 对甲酸的电氧化活性最高, 峰电流密度约为Pd/C催化剂上的180%; 而当Pd与Pb的质量比为2: 1时, 催化剂对甲酸氧化的稳定性最好.

Preparation of Carbon Supported PdPb Catalysts and Its Electrocatalytic Performance in Oxidation of Formic Acid

The carbon supported PdPb catalysts with different Pd and Pb mass ratios were prepared in the aqueous solution by a chemical reduction method.The studies show that the PdPb/C catalysts can promote the activity for formic acid electrooxidation and change the reaction mechanism.As the catalysts with small ratio of Pb,it can enhance the dispersion of active component and largely enhance the electrocatalytic activity of the catalysts toward the electrooxidation of formic acid.When the mass ratio of Pd and Pb is 8∶ 1,the catalyst shows the highest catalytic activity for formic acid oxidation,and the peak current density increases 180% compared to that on Pd/C.When the mass ratio of Pd to Pb is 2∶ 1,the catalyst shows the best behavior of stability.